Work is being done in which of these situations? All motions are at a constant velocity (including velocity = zero).
A.
Jessica pushes a 25 kilogram cart a distance of 10 meters.
B.
Bane carries a 20 kilogram box a distance of 50 meters.
C.
A weightlifter holds a 100 kilogram barbell over his head.
D.
Ali is trying to push a truck away from the parking lot.
E.
Yana carries a 5 kilogram bag a distance of 1 kilometer.
A. Work is being done. Jessica is applying a force to move the cart a distance, so work is being done.
B. Work is being done. Bane is applying a force to move the box a distance, so work is being done.
C. No work is being done. The weightlifter is holding the barbell over his head, but there is no motion or change in distance involved.
D. Work is being done. Ali is applying a force to push the truck away from the parking lot, so work is being done.
E. Work is being done. Yana is applying a force to move the bag a distance, so work is being done.